4345447
Questão 1
Responda
-
Bacterial cell
-
Eukaryotic cell
-
plasma membrane
-
internal membrane
Questão 2
Questão
The plasma membrane is involved in ..
Responda
-
cell communication
-
import and export of molecules
-
cells growth
-
motility
-
protein reorganization
-
Ca2+ storage
Questão 3
Questão
The most common phospholipid in cell membranes
Responda
-
phosphatidylcholine
-
phosphatidylserine
-
phosphatidylglycerol
Questão 4
Responda
-
choline
-
phosphate
-
glycerol
-
nonpolar (hydrophobic tails)
-
polar (hydrophilic head)
-
double bond
Questão 5
Responda
-
energetically unfavorable
-
energetically favorable
Questão 6
Questão
The properties of the lipid bilayer ensure that the plasma membrane is extremely flexible and able to self repair
Responda
- True
- False
Questão 7
Questão
Membrane and proteins do not retain their orientation during transfer between cell compartments
Responda
- True
- False
Questão 8
Responda
-
lumen
-
cytosol
-
extracellular fluid
-
transport vesicle
-
membrane protein
-
plasma membrane
-
cytosolic face
-
non-cytosolic face
Questão 9
Responda
-
Transporters class
-
ion channels class
-
receptors class
-
anchors class
-
enzymes class
-
transporters and channels
-
anchors
-
receptors
-
enzymes
-
cytosol
-
extracellular fluid
Questão 10
Responda
-
transmembrane
-
Monolayer associated alpha helix
-
lipid-linked
-
protein-attached
-
cytoso
-
barrel
Questão 11
Questão
Because the backbone of a polypeptide chain is hydrophilic, a transmembrane polypeptide chain usually crosses the lipid bilayer as...
Responda
-
a helix
-
a beta-sheet
-
a coil
Questão 12
Questão
Many single-pass transmembrane proteins are receptors for extracellular signals
Responda
- True
- False
Questão 13
Responda
-
peptide bonds
-
alpha-helix
-
phospholipid
-
hydrogen bond
-
hydrophobic amino acid side chain
Questão 14
Questão
A transmembrane [blank_start]hydrophilic[blank_end] pore can be formed by [blank_start]multiple[blank_end] [blank_start]amphipathic[blank_end] α helices or β sheets
Responda
-
hydrophilic
-
hydrophobic
-
multiple
-
single
-
amphipathic
-
amphoteric
-
aliphatic
Questão 15
Responda
-
Hydrophilic
-
Hydrophobic
-
aqueous pore
-
transmembrane alpha-helix
-
Pore
-
Beta sheet
-
hydrophobic core of the lipid bilayer
-
lipid bilayer
Questão 16
Responda
-
apical plasma mebrane
-
lateral plasma mebrane
-
basal plasma membrane
-
protein A
-
tight junction
-
protein B
-
basal lamina
-
blood stream
Questão 17
Questão
The cytoskeleton
Responda
-
gives a cell its shape
-
allows the cell to organize its internal components
-
to move (‘bones and muscles’ of the cell)
-
protects the cell
-
gives pigmentation to the cell
Questão 18
Questão
How many types of protein filaments there are that form the cytoskeleton differ in their composition, mechanical properties, and roles inside the cell
Responda
-
3
-
4
-
5
-
2
-
6
Questão 19
Responda
-
Intermediate filaments
-
microtubules
-
actin filaments
Questão 20
Questão
Ropelike fibers with a diameter of about 10 nm, made of fibrous proteins, can form a nuclear lamina or extend across the cytoplasm giving the cells mechanical strength, very flexible, may have great tensile strength, deform under stress but do not rupture
Responda
-
intermediate filaments
-
microtubules
-
actin filaments
Questão 21
Questão
Hollow cylinders made of protein tubulin, long and straight, one end attached to centrosome, outer diameter of about 25nm, rigid, rupture when stretched
Responda
-
intermediate filaments
-
microtubules
-
actin filaments
Questão 22
Questão
helical polymers of a protein, flexible, diameter about 7 nm, organized into linear bundles, two-dimensional networks, highly concentrated in the cortex (layer beneath the plasma membrane.
Responda
-
intermediate filaments
-
microtubules
-
actin filaments
Questão 23
Responda
-
alpha-helical region of monomer
-
coiled-coil dimer
-
staggered tetramer of two coiled dimers
-
lateral association of 8 tetramers
-
addition of 8 tetramers to growing filam
Questão 24
Responda
-
bundles of intermediate filaments
-
desmosome connecting two cells
Questão 25
Questão
Intermediate filaments meet at demos ones and provide stability so you cannot rip it easily apart
Responda
- True
- False
Questão 26
Responda
-
keratin filaments
-
vimentin-related filaments and vimentin
-
neurofilaments
-
nuclear limins
-
in epithelial cells
-
in connective-tissue cells,muscle/glial
-
in nerve cells
-
in all animal cells
Questão 27
Responda
-
nondividing cell
-
dividing cell
-
ciliated cell
-
cilium
-
poles of mitotic spindle
-
centrosome
Questão 28
Questão
How many protofilaments make 1 microtubule
Responda
-
13
-
12
-
10
-
15
-
9
Questão 29
Questão
microtubules do not have structural polarity
Responda
- True
- False
Questão 30
Responda
-
protofilament
-
lumen
-
plus end
-
minus end
-
microtubule
-
tubulin heterodimer
Questão 31
Questão
Do microtubules have a direction
Responda
-
yes
-
no
Questão 32
Responda
-
pair of centrioles
-
basal bodies
-
y-tubulin ring complex
-
nucleating sites
-
centrosome matrix
Questão 33
Responda
-
nucleus
-
centrosome
-
growing microtubule
-
microtubule capping protein
-
unstable microtubules
-
stable microtubules
-
unpolarized cell
-
polarized cell
-
GTP hydrolysis
-
GTP-tubulin
-
GDP-tubulin
-
GTP-cap
-
dynamic instability
-
Growing microtubule
-
Shrinking microtubule
Questão 34
Responda
-
ATPase
-
tall
-
globular head
-
kinesin
-
dynein
-
plus end
-
minus end
Questão 35
Questão
Many hair like cilia project from the surface of the epithelial cells that line the human respiratory tract.
Responda
- True
- False
Questão 36
Responda
-
radial spoke
-
central singlet microtubule
-
outer dynein arm
-
inner dynein arm
-
bend
-
slide
-
+ATP
-
In isolated doublet microtubules
-
in a normal flagellum
Questão 37
Questão
thin, flexible protein threads with a polarized structure
Responda
-
actin filaments
-
microtubules
-
intermediate filaments
Questão 38
Responda
-
actin with bound ATP
-
Actin with bound ADP
-
Treadmilling
-
Actin monomer
-
plus end
-
minus end
-
actin filament
Questão 39
Responda
-
actin cortex
-
lamellipodium
-
substratum
-
myosin motor protons slide actin fil.
-
focal contacts
-
Further protrusion
-
Attachment
-
Contraction
-
cortex under tension
-
movement of unpolymerised actine
-
actin polymerization
Questão 40
Responda
-
head
-
tail
-
+
-
-
-
vesicle
-
myosin-I
-
plasma membrane
Questão 41
Responda
-
myosin-II molecule
-
myosin-II filament
-
myosin heads
-
bare region
-
myosin-II
-
plasma membrane
Questão 42
Responda
-
nucleus
-
myofibril
-
sarcomere
-
Z disc
-
overlap region
-
thick filament (myosin-II)
-
Thin filament(actin)
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